hitunglah luas lingkaran dari masing masing data berikit ini ! a. r = 7 cm π = 22/7 b. r = 10 cm π = 3,14 c. d = 21 cm π = 22/7 d. r = 20 cm π = 3,14 e. d = 3

Luas = πr²
a. 22/7 x 7 x 7
= 22/7 x 49
= 154 cm²

b. 3,14 x 10 x 10
= 3,14 x 100
= 314 cm²

c. 22/7 x 10,5 x 10,5
= 22/7 x 110,25
= 346,5 cm²

d. 3,14 x 20 x 20
= 3,14 x 400
= 1256 cm²

e. 22/7 x 17,5 x 17,5
= 22/7 x 306,25
= 962,5 cm²

Maaf tadi saya jawabnya salah

a. π : 22/7
r : 7 cm
L = πr²
L = 22/7 x 7 x 7
L = 154 cm²

b. π : 3,14
r : 10 cm
L = πr²
L = 3,14 x 10 x 10
L = 314 cm²

c. π : 22/7
d : 21 cm = r : 10,5 cm
L = 1/4 πd²
L = 1/4 x 22/7 x 21 x 21
L = 1/4 x 22 x 21 x 3
L = 1.386/4
L = 346,5 cm²

L = πr²
L = 22/7 x 10,5 x 10,5
L = 2.425,5/7
L = 346,5 cm²

d. π : 3,14
r : 20 cm
L = πr²
L = 3,14 x 20 x 20
L = 3,14 x 400
L = 1.256 cm²

e. π : 22/7
d : 35 cm = r : 17,5 cm
L = 1/4 x πd²
L = 1/4 x 22/7 x 35 x 35
L = 1/4 x 22 x 35 x 5
L = 3.850/4
L = 962,5 cm²

L = πr²
L = 22/7 x 17,5 x 17,5
L = 6.737,5/7
L = 962,5 cm²

Maaf kalau salah